Like all the traders in DublinÂ’s historic Moore Street market, Agnes Brown inherited her fruit and vegetable stall from her mother, as her mother did from hers, and so on across the generations. So when Agnes receives an outrageous tax demand from the Revenue Office itÂ’s not just her livelihood thatÂ’s threatened but her heritage, and her dreams for her daughter CathyÂ’s future. While Maria and Rory embark on a hapless attempt to raise funds by swimming the channel, Agnes discovers thereÂ’s more to the tax demand than she first realised. The whole market is under threat from a ruthless developer. Agnes Brown is all that stands between Moore Street and the bulldozers. As the deadline for payment looms, Mrs. Brown must take on the full forces of the Irish establishment to save the market and protect her heritage. Her only help, her family and friends: Winnie McGoogan, her eccentric neighbour; Buster Brady, DermotÂ’s dodgy best mate and his motley troop of blind trainee Ninjas; and Maydo-Archer, a barrister with an unhelpful affliction. As daughter Cathy turns her back on the family business, and unwanted secrets emerge from Agnes' past, could the Brown matriarch finally be out of her depth?